align the # 1 cylinder mark (some models say "R" ) that is located on the side of the crank (pick up coil side) to the TDC mark on the case on the compression stroke. The exshuast cam gear should have 2 arrows on it marked 1 and 2. The #1 arrow points straight forward pretty much level with the top of the valve cover surface and the #2 arrow points straight up. starting AT the #2 arrrow count 18 pins back to the intake gear that has a third arrow on it. The third arrow should line up with the 18th pin.